Bioremediation
CBSE · Class 12 · Biotechnology
Most important questions from Bioremediation for CBSE Class 12 Biotechnology board exam 2026. MCQs, short answer, and long answer questions with marks.
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What is the usual BOD removal achieved by primary treatment?
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30 to 40 percent
Primary treatment achieves about 30 to 40 percent BOD removal.
Which is the correct role of activated sludge in sewage treatment?
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It is sludge settling at the bottom of the second settling tank with a high density of bacteria
Activated sludge is the sludge that settles at the bottom of the second settling tank and is rich in conditioned bacteria.
Which gas is the major product of anaerobic sludge digestion?
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Methane
Anaerobic sludge digestion produces methane as the major gas, along with carbon dioxide and small amounts of other gases.
Which waste is treated as a good example of fertiliser after sludge processing?
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Milorganite
Milorganite is cited as an example of a fertiliser produced from processed anaerobic sludge digest by-product.
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
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